Data Services:Examples

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The following is most of a letter sent to new users of the CEDAR Database with some instructions about how to access the data on-line.

The 2006 CEDAR Database catalog is available on the web at http://cedarweb.hao.ucar.edu/catalog/catalog.pdf (141 pp)

Three explicit examples of how to get data are at the end of this message.

  1. Simple Example to get data from the CEDAR Database
  2. Advanced Example to get JRO data from the CEDAR Database
  3. Advanced Example to get (or exclude) large Barker Ne ARO data from the CEDAR Database

It is possible to look at summary plots of the data without a web name. Your web name allows you to pick up the digital data next to the plots. It is also possible to get only certain parameters rather than the entire data set by selecting on those parameters in the 'Get/plot data' section.

To get data from the web go to 'Get/plot data'. The data can be delivered in 'TAB', 'FLAT', 'INFO', 'DAS', 'DDS', 'OPenDAP', and 'STREAM' formats. The 2 ascii formats are 'TAB' and 'FLAT', where 'TAB' is similar in structure to the hierarchical ascii format, and 'FLAT' is flat file format data where the 1-dimensional parameters and time information are repeated for each 2-dimensional parameter. 'STREAM' is the .cbf ('Cray Blocked Binary') CEDAR DB binary format. 'INFO' will give you a description of the data, and ALSO will give you units and multipliers, which are essential to know. The description of the data is repeated in the summary plot section, but this does not contain the parameter list, units and multipliers. However, the summary plot area does give the NECESSARY ACKNOWLEDGEMENTS and CONTACTS. You can also find Fortran and IDL code to read the TAB format data.

If you get OPeNDAP at your own site on your own browser, then you can get OPenDAP binary data instead and use it in IDL, Matlab or other codes you may have. Please contact Jose Garcia or Patrick West about getting and installing this free software.

You can get model software for mostly zipped archive source files in fortran.

For those interested in GSWM, the older model results are in the CEDAR DB, so go to the linked web site on GSWM for the newer model results at

For those interested in model outputs, be aware that there are new TIE-GCM and TIME-GCM runs for 365 days in 2002 using the 10.7 cm flux and Kp as inputs. There are also constant conditions of 18.3 GW auroral input and 53.8 kV crosstail potential drop for the TIE-GCM. These will be added to the DB eventually, but are presently available as netCDF files from Barbara Emery (emery@ucar.edu).

For those interested in hemispheric power (Hp) indices, I have intercalibrated the DMSP and NOAA satellites (the NOAA-12 and later HP values are about two times larger than they should be) and corrected for noise, sensor degradation, sunlight contamination, etc. The corrected and intercalibrated values of Hp for electrons (and ions and total for NOAA) were put in the DB in June 2005 as instrument number 175 (kinst for ehp) and kind of data 31100 (kindat). The median hourly value of the electron Hp is available as 175/31200. A new calibration including a revised NOAA-18 was done in July 2006, and will be added to the DB in October 2006.

The DMSP Hp values were found in May 2006 to not include the 2004 calibrations from AFRL, which affect most of the values. They were corrected 15 June 2006.

If you have trouble down-loading the data from the web because of slow internet connections, you can ask for data to be put onto anonymous ftp or have it put on CDRom or other media and sent to you.

Please contact us if you have any questions or comments concerning the web access to the CEDAR Database.

Dr. Barbara Emery and Jose Garcia